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[v2,18/27] target-i386: emulate XCHG using atomic helper

Message ID 1467392693-22715-19-git-send-email-rth@twiddle.net (mailing list archive)
State New, archived
Headers show

Commit Message

Richard Henderson July 1, 2016, 5:04 p.m. UTC 
From: "Emilio G. Cota" <cota@braap.org>

Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1467054136-10430-19-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-i386/translate.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)
diff mbox

Patch

diff --git a/target-i386/translate.c b/target-i386/translate.c
index be097a6..525c445 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -5556,12 +5556,8 @@  static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
             gen_lea_modrm(env, s, modrm);
             gen_op_mov_v_reg(ot, cpu_T0, reg);
             /* for xchg, lock is implicit */
-            if (!(prefixes & PREFIX_LOCK))
-                gen_helper_lock();
-            gen_op_ld_v(s, ot, cpu_T1, cpu_A0);
-            gen_op_st_v(s, ot, cpu_T0, cpu_A0);
-            if (!(prefixes & PREFIX_LOCK))
-                gen_helper_unlock();
+            tcg_gen_atomic_xchg_tl(cpu_T1, cpu_A0, cpu_T0,
+                                   s->mem_index, ot | MO_LE);
             gen_op_mov_reg_v(ot, reg, cpu_T1);
         }
         break;